A Reploid, or Repliroid (レプリロイド Repuriroido?, a portmanteau of the words replica and android) in the original Japanese games, from the science fiction video game series Mega Man X, Mega Man Zero and Mega Man ZX, is an android with complete free will and thought processes comparable to those of humans.
Reploids can be thought of as the next evolutionary step of the robots from the classic series. For all intents and purposes, Reploids are the same as humans on a mental level; they think and feel, giving them the ability to make their own decisions and develop unique personalities. Although Reploids undergo major physical changes throughout the series, they generally retain this one trait with the exception of mentally degraded Reploids such as the Pantheons.
Reploids are humanoids, and may appear either male or female. They usually have a human face (and sometimes, hair), as well as bulging armor around the forelimbs and upper body. However, many are built to actually resemble robotic animals with humanoid traits. These particular Reploids tend to be designed for very specific tasks; for example, a heavy duty Reploid may be large and bulky, whereas a marine Reploid may be based on a fish. There is no limit to the tasks Reploids can perform with the right design.
It is eventually revealed in the series that Reploids have a form of DNA; Iris even mentions that a Reploid's DNA is similar to a human's soul, calling it a DNA Soul. However, DNA was shown to integrate the actual body as well when Gate used a piece of Zero to carry out his plans. DNA can be manipulated for several purposes, such as Reploid resurrection (said to be illegal in Mega Man X6) and even cloning.
As machines, Reploids do not age, although they still require rest and maintenance to remain functional. The Maverick Hunters have capsules which X and Zero used to recover, although cybernetic beds were also used by Reploids in Giga City.
Although Reploids are never explicitly shown consuming food or beverages in-game, the series states that they useEnergy Crystals to maintain themselves
Robots with highly advanced information processing capabilities, allowing them to think and act almost identically to humans.
Dr. Cain discovered the sealed-away X and created the other Reploids based on him. In addition to Reploids, there are also the more standard type of robots called "Mechaniloids".